WO2012077793A1

WO2012077793A1 - Structure for attaching ultrasound transducer

Info

Publication number: WO2012077793A1
Application number: PCT/JP2011/078591
Authority: WO
Inventors: 崇志辻; 直哉東; 康志永野
Original assignee: パナソニック株式会社
Priority date: 2010-12-10
Filing date: 2011-12-09
Publication date: 2012-06-14
Also published as: EP2650694A4; JP2012122936A; EP2650694A1; EP2650694B1; CN103261910B; CN103261910A; US20130250732A1; US9564116B2

Abstract

Disclosed is a structure for attaching an ultrasound transducer, which is provided with a housing that has: a cylindrical main body section, which has, on the front surface, the passing surface that passes through ultrasound waves, and which houses the ultrasound transducer; and a plurality of connecting pieces, which are provided on the side surface of the main body section. The ultrasound transducer is also provided with a holder, which is fixed on the rear surface of a bumper, and which holds the housing such that the passing surface of the housing faces an opening of the bumper. The holder is provided with a plurality of receiving pieces, to which respective connecting pieces are removably connected. The receiving pieces are fixed to the rear surface of the bumper such that the receiving pieces surround the opening.

Description

Ultrasonic transducer mounting structure

The present invention relates to an ultrasonic transducer mounting structure, and more particularly to an ultrasonic transducer mounting structure for mounting an ultrasonic transducer to a bumper of an automobile.

Conventionally, ultrasonic transducers such as an ultrasonic speaker (ultrasonic transmitter) for transmitting ultrasonic waves and an ultrasonic microphone (ultrasonic receiver) for receiving ultrasonic waves have been provided.

Further, conventionally, an ultrasonic sensor for detecting an object using such an ultrasonic transducer has been provided. That is, conventionally, an ultrasonic sensor that transmits ultrasonic waves and receives ultrasonic waves reflected by an obstacle has been provided. Examples of this type of ultrasonic sensor include a Doppler sensor that determines the presence or absence of an obstacle based on a Doppler shift in received ultrasonic waves.

Furthermore, as the above-described ultrasonic sensor, there is one used by being attached to a bumper 1 of an automobile as shown in FIG. 6 (for example, see Document 1 [Japanese Published Patent Application No. 2010-194441]).

More specifically, the ultrasonic sensor of FIG. 6 is fixed to the bumper 1 so as to be inserted into the exposed hole 11 provided in the bumper 1, and is inserted into the exposed hole 11 from the outer surface side of the bumper 1. And an inner block 42 coupled to the outer block 41 from the inner surface side of the bumper 1. That is, the ultrasonic sensor is fixed to the bumper 1 by coupling the outer block 41 and the inner block 42 with the bumper 1 sandwiched therebetween.

However, in the structure in which the bumper 1 is sandwiched between the outer block 41 and the inner block 42 as shown in FIG. 6, a part of the outer block 41 protrudes to the outer surface side (left side in FIG. 6). The appearance when attached to the bumper 1 was poor.

The present invention has been made in view of the above reasons, and an object of the present invention is to provide an ultrasonic transducer mounting structure capable of improving the appearance when mounted on a bumper.

The first form of the ultrasonic transducer mounting structure according to the present invention is provided on the front surface of the main body having a passage surface that allows ultrasonic waves to pass therethrough and housing the ultrasonic transducer. A housing having a plurality of coupling pieces, and a holder that is fixed to the back surface of the bumper and holds the housing so that the passage surface of the housing faces the opening of the bumper. Each of the coupling pieces includes a plurality of receiving pieces that are detachably coupled, and the plurality of receiving pieces are fixed to the back surface of the bumper so as to surround the opening.

In the second form of the ultrasonic transducer mounting structure according to the present invention, in the first form, the holder includes a plurality of fixing plates respectively corresponding to the plurality of receiving pieces. Each of the fixing plates is fixed to the back surface of the bumper on one surface in the thickness direction. The receiving piece is provided on the other surface of each fixing plate in the thickness direction. Each of the fixing plates has flexibility so as to be deformed along the back surface of the bumper.

In the third form of the ultrasonic transducer mounting structure according to the present invention, in the second form, the fixing plate is provided with a slit and a groove so that the fixing plate is bent along the back surface of the bumper. At least one of the above is provided.

In a fourth form of the ultrasonic transducer mounting structure according to the present invention, in the first to third forms, the coupling piece and the receiving piece corresponding to the coupling piece are around a central axis of the opening. Are configured to contact each other in the rotational direction.

In a fifth embodiment of the ultrasonic transducer mounting structure according to the present invention, in the first to fourth embodiments, the holder is arranged so that the main body portion contacts the back surface of the bumper with a predetermined pressure. Configured to hold the housing.

It is a disassembled perspective view of the attachment structure of the ultrasonic transducer of one Embodiment of this invention. It is a perspective view of the attachment structure of the ultrasonic transducer of the embodiment. It is sectional drawing of the connector in the attachment structure of the ultrasonic transducer of the said embodiment. It is sectional drawing which abbreviate | omitted a part of attachment structure of the ultrasonic transducer of the said embodiment. It is the perspective view which looked at the attachment structure of the ultrasonic transducer of the above-mentioned embodiment from the front. It is sectional drawing which shows a prior art example.

The ultrasonic transducer mounting structure of the present embodiment includes a housing 3 and a holder 6 as shown in FIG.

The housing 3 is formed using a synthetic resin, and includes a main body portion 31, a plurality of coupling pieces 32, and a connector portion 33.

The main body 31 has a passage surface 311 through which ultrasonic waves pass, and is formed in a cylindrical shape that houses an ultrasonic transducer (not shown).

In the present embodiment, the ultrasonic transducer is an electroacoustic transducer having both a function of transmitting ultrasonic waves and a function of receiving ultrasonic waves. Therefore, the ultrasonic wave generated by the ultrasonic transducer is output to the outside through the passage surface 311. In addition, external ultrasonic waves are received by the ultrasonic transducer through the passage surface 311.

Note that the ultrasonic transducer may have only one of a function of transmitting ultrasonic waves and a function of receiving ultrasonic waves. Further, both an ultrasonic transducer that transmits ultrasonic waves and an ultrasonic transducer that receives ultrasonic waves may be used.

The main body 31 houses a signal processing circuit (not shown) that performs processing for generating ultrasonic waves in the ultrasonic transducer and processing for detecting an obstacle based on the output of the ultrasonic transducer. The configuration of the signal processing circuit is changed according to the configuration of the ultrasonic transducer.

The coupling piece 32 is provided on the side surface of the main body 31. In the present embodiment, the housing 3 includes two coupling pieces 32. The two coupling pieces 32 are aligned in a direction perpendicular to the central axis of the main body 31. The coupling piece 32 is used to fix the housing 3 to the holder 6.

The connector part 33 is used for connecting the main body part 31 to an external circuit.

Among the configurations of the housing 3, conventionally known configurations can be employed for the main body portion 31 and the connector portion 33. Therefore, detailed description thereof will be omitted.

The holder 6 is fixed to the back surface of the bumper 1 (upper surface in FIG. 1) and is configured to hold the housing 3 so that the passage surface 311 of the housing 3 faces the opening 11 of the bumper 1.

The holder 6 corresponds to a plurality (two in this embodiment) of receiving pieces 22 to which a plurality of (two in the present embodiment) coupling pieces 32 are detachably coupled, and a plurality of receiving pieces 22, respectively. A plurality of fixing plates 21.

The fixing plate 21 is fixed to the back surface of the bumper 1 on one surface in the thickness direction (the lower surface in FIG. 1). A receiving piece 22 is provided on the other surface in the thickness direction of the fixing plate 21 (upper surface in FIG. 1). The fixing plate 21 has flexibility so as to be deformed along the back surface of the bumper 1.

In this embodiment, one mounting plate 2 is constituted by one fixing plate 21 and one receiving piece 22.

That is, the holder 6 includes two mounting bases 2 (2A, 2B). The two mounting bases 2 </ b> A and 2 </ b> B are fixed to the back surface of the bumper 1 so as to surround the opening 11. In other words, the plurality of receiving pieces 22 are fixed to the back surface of the bumper 1 so as to surround the opening 11. In the present embodiment, the two

mounting bases

2A and 2B are fixed to the back surface of the bumper 1 so as to sandwich the opening 11. In particular, the two mounting bases 2 </ b> A and 2 </ b> B have the same shape, and are arranged so as to be symmetrical twice with respect to the central axis of the opening 11.

As described above, the ultrasonic transducer mounting structure of this embodiment includes an ultrasonic transducer having a function of receiving ultrasonic waves. Therefore, it can be said that the ultrasonic transducer mounting structure of the present embodiment is an ultrasonic sensor mounting structure.

Hereinafter, the mounting structure of the ultrasonic transducer (ultrasonic sensor) of this embodiment will be further described.

As shown in FIG. 1, the present embodiment is fixed to a bumper 1 in which a circular exposure hole (opening) 11 is provided, and the bumper 1 is arranged so as to sandwich the exposure hole 11. Two mounting bases 2 that are bonded and fixed to the inner surface (upper surface in FIG. 1), and a sensor main body (housing) 3 that is detachably coupled to the mounting bases 2 by concavo-convex engagement.

Hereinafter, the directions of ABCDEF in FIG. That is, the direction that is the inner surface side of the bumper 1 in the thickness direction and the direction that is attached to the bumper 1 in this direction is referred to as upward, and the direction in which the mounting bases 2 are aligned is referred to as the left-right direction. Note that the above directions are defined for convenience of explanation, and do not necessarily match the directions in the actual use state. In the present embodiment, the lower direction in the above expression is usually the front or the rear of the vehicle. Used towards.

More specifically, each mounting base 2 is made of, for example, synthetic resin, and each mounting base 2 has a common dimensional shape. Each mounting base 2 has a rectangular flat plate-like fixing portion (fixing plate) 21 whose thickness direction is the up-down direction and the longitudinal direction is the front-rear direction as a whole, and a central portion in the front-rear direction on the upper surface of the fixing portion 21. It has a flat plate-like coupling portion (receiving piece) 22 that protrudes and has a thickness direction directed in the front-rear direction. The lower surface of the fixing portion 21 of each mounting base 2 is bonded and fixed to the inner surface of the bumper 1 using, for example, a well-known adhesive sheet 5. In addition, as a method of fixing each mounting base 2 to the inner surface of the bumper 1, for example, instead of the adhesive fixing using the adhesive sheet 5 as described above, for example, adhesive fixing using an adhesive, welding, or screwing Other methods may also be used.

Here, since the bumper 1 constitutes the appearance of the vehicle, the bumper 1 has a curved surface shape depending on the design of the vehicle. Therefore, in the present embodiment, a plurality of grooves 211 are provided on the upper surface of the fixing portion 21 of the mounting base 2 on both the front and rear sides of the coupling portion 22, and a plurality of

slits

212 and 213 opened vertically are provided. Is provided. In other words, by fixing the thinned portion of the fixing portion 21 due to the groove 211 or by deforming the fixing portion 21 so as to change the width of the

slits

212 and 213, the fixing portion 21 can be fixed to a certain degree of curved surface. 21 can be bonded. Further, an engagement convex portion 221 is projected from one surface in the thickness direction of the coupling portion 22 of the mounting base 2 (the front surface of the left mounting base 2 and the rear surface of the right mounting base 2). The joint convex part 221 is inclined so that the projecting dimension becomes smaller toward the upper end as a whole (that is, as it moves away from the fixed part 21). As a specific arrangement in the present embodiment, the engagement convex portion 221 is provided slightly lower right than the center of the above surface. In addition, as the

slits

212 and 213, two slits (hereinafter referred to as "first slits") 212 extended from the vicinity of each of the front and rear of the engagement convex portion 221 to the end in the front-rear direction. And two slits (hereinafter referred to as “second slits”) that are released to the outside in the left-right direction at each of the left and right sides of the engaging recess 221 and separate the fixing portion 21 and the coupling portion 22 on both front and rear sides of the coupling portion 22. ) 213 is provided. Further, two grooves 211 are provided before and after the coupling portion 22, respectively extending from the vicinity of one of the left and right ends of the coupling portion 21 to the open end of the first slit 212 (that is, the outer end in the front-rear direction). Has been. The number and shape of the grooves 211 and the

slits

212 and 213 can be appropriately changed according to the assumed shape of the bumper 1.

Thus, the fixed plate 21 is formed in a rectangular plate shape having a longitudinal direction (arrow EF direction) and a width direction (arrow CD direction). The fixing plate 21 is made of an elastic resin material, and thus has flexibility so as to change along the back surface of the bumper 1.

The fixing plate 21 is provided with

slits

212 and 213 and a groove 211 so that the fixing portion 21 bends along the back surface of the bumper.

In the present embodiment, the fixing plate 21 includes two slits 212, two slits 213, and four grooves 211. The slit 212 extends along the longitudinal direction from each of the first end (the end on the arrow E side) and the second end (the end on the arrow F side) in the longitudinal direction of the fixed plate 21 toward the central portion in the longitudinal direction. Yes. The slit 212 makes it easier for the fixing plate 21 to bend in the width direction. The slit 213 extends along the width direction from the first end (the end on the arrow C side) and the second end (the end on the arrow D side) in the width direction of the fixed plate 21 toward the center in the width direction. Yes. The slit 213 makes it easier for the fixing plate 21 to be bent in the longitudinal direction. All of the four grooves 211 are formed on the other surface of the fixing plate 21 in the thickness direction. The four grooves are formed in a straight line so as to connect the open end of the slit 212 and the open end of the slit 213. By this groove 211, the fixing plate 21 is easily bent in the diagonal direction.

The receiving piece 22 protrudes from the other surface of the fixing plate 21 in the thickness direction. The receiving piece 22 is configured to be detachably coupled to the coupling piece 32 of the housing 3. The receiving piece 22 includes an engaging convex portion 221, a base portion 222, and a base portion 223. The base 222 is formed in a rectangular plate shape. The width direction (arrow CD direction) of the base 222 matches the width direction of the fixed plate 21, and the thickness direction (arrow EF direction) of the base 222 matches the longitudinal direction of the fixed plate 21. The base 223 is formed on one surface in the thickness direction of the base 222 (a surface on the arrow E side in the mounting base 2A and a surface on the arrow F side in the mounting base 2B). The base part 223 is formed in a rectangular parallelepiped shape. The engaging convex part 221 is formed on the front surface of the base part 223 (the surface on the arrow E side in the mounting base 2A and the surface on the arrow F side in the mounting base 2B).

In addition, the sensor body 3 includes a columnar body portion 31 whose axial direction is directed vertically, and two main body portions 31 on the outer peripheral surface of the body portion 31 that are opposite to each other across the body portion 31. It has a coupling portion (coupling piece) 32 protruding in the radial direction (outward in the left-right direction), and a connector portion 33 extending from the upper end of the main body 31 to the rear of the main body 31. The main body 31 of the sensor main body 3 holds transmission / reception means (not shown) which is an ultrasonic transducer that serves as both transmission means for transmitting ultrasonic waves and reception means for receiving ultrasonic waves. And the lower end surface of the main-body part 31 of the center main body 3 is the entrance / exit surface 311 in which an ultrasonic wave enters and exits. The transmission / reception means described above performs mutual conversion between ultrasonic waves and electrical signals, and such transmission / reception means can be realized by a known technique using, for example, a piezoelectric element. The connector 33 holds a connector for electrical connection with an external circuit. Further, even if circuit components constituting a signal processing circuit that performs signal processing such as amplification and noise removal between the transmission / reception means and the external circuit are housed and held in the main body 31 or the connector 33, Good.

Each coupling portion 32 of the sensor body 3 has two

sandwich pieces

321 and 322 which are flat with the thickness direction being the front-rear direction and are opposed to each other with a gap therebetween. In the sensor body 3, at least each coupling portion 32 is made of an elastically deformable material such as synthetic resin, and each coupling portion 32 increases the distance between the lower end portions of the sandwiching

pieces

321 and 322, respectively. Elastic deformation is possible. Further, in each coupling portion 32, an engagement hole 323 into which the engagement convex portion 221 of the mounting base 2 is engaged is provided in one sandwiching piece 321 on the clockwise direction side when viewed from the incident / exit surface 311 side. . Furthermore, in order to easily generate the elastic deformation, an appropriate slit 324 is provided around the engagement hole 323 in the sandwiching piece 321 of each coupling portion 32.

As described above, the coupling piece 32 includes the sandwiching piece (first sandwiching piece) 321 and the sandwiching piece (second sandwiching piece) 322. The second sandwiching piece 322 is formed in a U shape having an accommodation space 3221 for accommodating the receiving piece 22. The receiving piece 22 is inserted into the accommodation space 3221 from the front (in the direction of arrow B) of the second clip piece 322. Further, the second clip piece 322 has an opening 3222 that allows the base portion 223 of the receiving piece 22 to face the outside. The first clip piece 321 is formed in a rectangular plate shape and has an engagement hole 323 that receives the engagement convex portion 221. The first sandwiching piece 321 is disposed in the opening 3222 so that the receiving piece 22 in the accommodation space 3221 is sandwiched between the first sandwiching piece 321. In addition, since the 1st clamping piece 321 contacts the front surface of the base part 223 of the receiving piece 22, a predetermined clearance gap arises between the 1st clamping piece 321 and the base 222 (refer FIG. 3). This gap is used as a space for displacing the first clip piece 321. The first clip piece 321 is connected to the second clip piece 322 by two spring portions 325 so that the first clip piece 321 can be displaced with respect to the second clip piece 322. Each spring portion 325 is defined by two slits 324.

When fixing the present embodiment to the bumper 1, first, the two mounting bases 2 are bonded and fixed to the inner surface of the bumper 1 in an arrangement with the exposure hole 11 interposed therebetween. At this time, the coupling portion 22 is positioned in the vicinity of the exposure hole 11, and the protruding directions of the engaging convex portions 221 are opposite to each other with the two mounting bases 2.

Further, one coupling portion 22 of the mounting base 2 is introduced between the

sandwich pieces

321 and 322 of each coupling portion 32 of the sensor body 3, and the sensor body 3 is pushed downward (that is, the bumper 1 side). Then, when the sandwiching piece 321 slides on the inclined surface of the engaging convex part 221, each coupling part 32 is elastically deformed so as to increase the distance between the lower ends of the sandwiching

pieces

321 and 322, respectively. Eventually, when the engagement holes 323 of the respective coupling portions 32 reach the engagement convex portions 221, the respective engagement convex portions 221 are engaged with the engagement holes 323 as shown in FIG. Enter. Here, the sensor body 3 is prohibited from being displaced upward (that is, in a direction away from the bumper 1) by contact between the inner surface of the engagement hole 323 and the engagement convex portion 221 of the mounting base 2. Further, rotation of the sensor body 3 around the axis of the body portion 31 is prohibited by contact between the

clip pieces

321 and 322 and the coupling portion 22 of the mounting base 2. That is, the coupling portion 22 of the mount 2 is also a rotation prohibiting portion. In the above state, the upper end portion of the clip piece 321 having the engagement hole 323 is positioned above the upper end of the coupling portion 22 of the mounting base 2.

In practice, the work of bonding and fixing each mounting base 2 to the bumper 1 may be after the work of connecting each mounting base 2 to the sensor body 3.

Here, as shown in FIG. 4, the sensor body 3 is projected from the fixing portion 21 of the mounting base 2 in a state where the sensor main body 3 is attached to the mounting base 2 as described above, and the coupling portion 22. The protrusion dimension to the opposite side (downward in FIG. 4) is substantially the same as the thickness dimension of the bumper 1 that is assumed to be attached. Thereby, in the state where the attachment of the present embodiment to the bumper 1 is completed, the incident / exit surface 311 is substantially flush with the outer surface (the lower surface in FIG. 4) of the bumper 1. When the inner diameter of the exposed hole of the bumper 1 is substantially the same as the outer diameter of the main body 31 of the sensor body 3, only the incident / exit surface 311 is viewed from the outer surface side of the bumper 1 as shown in FIG. Exposed from.

When the sensor body 3 is removed from each mounting base 2, a direction in which the portion above the coupling portion 22 of the mounting base 2 in the sandwiching piece 321 having the engagement hole 323 approaches the other sandwiching piece 322 (in FIG. 3). Press to the right. Then, the coupling portion 32 is elastically deformed so that the above-described sandwiching piece 321 rotates with the contact point with the coupling portion 22 of the mount 2 as a fulcrum, and the engagement between the engagement hole 323 and the engagement convex portion 221 is released. Therefore, the sensor main body 3 may be displaced as it is (that is, in a direction away from the fixing portion 21 of the mount 2).

As described above, the present embodiment is an ultrasonic sensor attached to the bumper 1, and transmits ultrasonic waves to the plurality of attachment bases 2 each having the fixing portion 21 fixed to the inner surface of the bumper 1. A sensor main body 3 holding at least one of a transmitting means and a receiving means for receiving ultrasonic waves, each mounting base 2 has a coupling portion 22, and each sensor main body 3 is connected to a coupling portion 22 of the mounting base 2. A plurality of coupling portions 32 that are detachably coupled to each other are provided.

This ultrasonic sensor includes at least one mounting base 2 in which at least one of the groove 211 and the

slits

212 and 213 is provided in the fixed portion 21.

Further, the ultrasonic sensor includes at least one mounting base 2 having a rotation prohibiting portion that prohibits rotation of the sensor main body 3 with respect to each mounting base 2 by contacting the sensor main body 3.

In other words, the ultrasonic transducer mounting structure of the present embodiment has a cylindrical main body 31 that has a passage surface (incident / exit surface) 311 that allows ultrasonic waves to pass therethrough and accommodates the ultrasonic transducer, and a main body portion. A housing (sensor body) 3 having a plurality of coupling pieces (coupling portions) 32 provided on the side surface of 31, and a passage surface 311 of the housing 3 fixed to the back surface of the bumper 1 is an opening (exposed hole) 11 of the bumper 1. And a holder 6 for holding the housing 3 so as to face the surface. The holder 6 includes a plurality of receiving pieces (coupling portions) 22 to which each of the plurality of coupling pieces (coupling portions) 32 is detachably coupled. The plurality of receiving pieces 22 are fixed to the back surface of the bumper 1 so as to surround the opening 11.

Further, in the ultrasonic transducer mounting structure of the present embodiment, the holder 6 includes a plurality of fixing plates (fixing portions) 21 respectively corresponding to the plurality of receiving pieces 22. Each fixing plate 21 is fixed to the back surface of the bumper 1 on one surface in the thickness direction. A receiving piece 22 is provided on the other surface of each fixing plate 21 in the thickness direction. Each fixing plate 21 has flexibility so as to be deformed along the back surface of the bumper 1.

In the ultrasonic transducer mounting structure of the present embodiment, the fixing plate 21 is provided with slits 212 (213) and grooves 211 so that the fixing plate 21 bends along the back surface of the bumper 1. . In the ultrasonic transducer according to this embodiment, the fixing plate 21 is provided with at least one of a slit 212 (213) and a groove 211 so that the fixing plate 21 bends along the back surface of the bumper 1. Also good.

Further, in the ultrasonic transducer mounting structure of the present embodiment, the coupling piece (coupling part) 32 and the receiving piece (coupling part) 22 corresponding to the coupling piece 32 are in the rotational direction around the central axis of the opening 11. It is comprised so that it may mutually contact | abut.

According to the above configuration, unlike the case where the ultrasonic sensor is composed of two blocks and the two blocks are coupled to each other in such a manner that the bumper is sandwiched from inside and outside, a part of the ultrasonic sensor protrudes outside the bumper. There is no need to let them. Therefore, the appearance is improved as compared with the case where the sensor body 3 protrudes outside the bumper 1. In addition, since the sensor body 3 is provided with a plurality of coupling portions 32, the sensor body 3 is less likely to be detached from the bumper 1 compared to the case where only one coupling portion 32 is provided.

In addition, the sensor body 3 is brought into contact with the upper surface (that is, the inner surface) of the bumper 1, and the vertical width between the lower surface of the engagement convex portion 221 and the lower surface of the fixing portion 21 in each mounting base 2 is determined. In this case, the vertical width between the surface contacting the upper surface of the bumper 1 and the lower end of the engagement hole 323 may be slightly smaller. That is, in the state where the sensor main body 3 is attached to the bumper 1 using the mounting base 2, the sensor main body 3 and each mounting base 2 are elastically deformed, and the sensor main body 3 is pressed against the upper surface of the bumper 1 by this elastic force. It is done.

That is, in this ultrasonic sensor, when the sensor main body 3 is coupled to each mounting base 2 fixed to the bumper 1, at least one of the mounting base 2 and the sensor main body 3 has the sensor main body 3 attached thereto. It is elastically deformed to generate an elastic force that presses against the inner surface of the bumper 1. That is, in the ultrasonic transducer according to the present embodiment, the holder 6 is configured to hold the housing 3 so that the main body 31 contacts the back surface of the bumper 1 with a predetermined pressure.

If the above configuration is adopted, the vertical width between the lower surface of the engaging convex portion 221 and the lower surface of the fixing portion 21 in the mounting base 2 is set so that the surface in contact with the upper surface of the bumper 1 in the sensor body 3 and the engaging hole 323. As compared with the case where the width of the sensor body 3 is larger than the vertical width between the lower end of the sensor body, rattling of the sensor body 3 attached to the bumper 1 is suppressed.

Details can be changed as appropriate. For example, the number of

coupling portions

22 and 32 and the number of mounting bases 2 are not limited to two, and may be three or more. When the holder 6 includes n (n is an integer of 3 or more) mounts 2, the n mounts 2 are preferably arranged so as to be n times symmetrical. It is also possible to provide two or more coupling portions 22 on one mounting base 2. Specifically, for example, a ring-shaped or U-shaped structure as a whole such that at least one of the front end portions and the rear end portions of the fixing portions 21 of the two mounting bases 2 in the present embodiment is connected to each other. And However, as in the present embodiment, when the plurality of mounting bases 2 corresponding to the plurality of coupling portions 32 of the sensor main body 3 are used in a one-to-one relationship, the coupling portions 22 coupled to the plurality of coupling portions 32 are used. Compared to the case of providing on one mounting base 2, it is easier to correspond to the bumper 1 having a curved shape.

Moreover, as a structure of the

coupling parts

22 and 32, for example, a structure in which the coupling part 22 of the mounting base 2 sandwiches the coupling part 32 of the sensor main body 3 may be used, contrary to the present embodiment.

Claims

A housing having a cylindrical main body portion having a passage surface through which ultrasonic waves pass and housing an ultrasonic transducer; and a plurality of coupling pieces provided on a side surface of the main body portion;
A holder that is fixed to the back surface of the bumper and holds the housing so that the passage surface of the housing faces the opening of the bumper;
With
The holder includes a plurality of receiving pieces to which the plurality of coupling pieces are detachably coupled,
The ultrasonic transducer mounting structure, wherein the plurality of receiving pieces are fixed to the back surface of the bumper so as to surround the opening.
The holder includes a plurality of fixing plates respectively corresponding to the plurality of receiving pieces,
Each of the fixing plates is fixed to the back surface of the bumper on one surface in the thickness direction,
The receiving piece is provided on the other surface in the thickness direction of each fixing plate,
The ultrasonic transducer mounting structure according to claim 1, wherein each of the fixing plates has flexibility so as to be deformed along the back surface of the bumper.
The ultrasonic transducer according to claim 2, wherein the fixing plate is provided with at least one of a slit and a groove so that the fixing plate bends along the back surface of the bumper. Construction.
4. The coupling piece and the receiving piece corresponding to the coupling piece are configured to contact each other in a rotational direction around the central axis of the opening. 2. An ultrasonic transducer mounting structure according to item 1.
The holder is configured to hold the housing so that the main body comes into contact with the back surface of the bumper with a predetermined pressure. Ultrasonic transducer mounting structure.